openpgp: Implement FromStr for some types.

  - This implements std::str::FromStr for types that have
    string-representations and are reasonably likely to be encountered
    by downstream users, e.g. fingerprints or messages.  This allows
    us to do `"xxx".parse()?`.

  - Fixes #320.

1 files changed, 8 insertions, 0 deletions

diff --git a/openpgp/src/keyid.rs b/openpgp/src/keyid.rs
index 799bf4fd..2e77c962 100644
--- a/openpgp/src/keyid.rs
+++ b/openpgp/src/keyid.rs
@@ -20,6 +20,14 @@ impl fmt::Debug for KeyID {
     }
 }
 
+impl std::str::FromStr for KeyID {
+    type Err = failure::Error;
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        Self::from_hex(s)
+    }
+}
+
 impl From<KeyID> for Vec<u8> {
     fn from(id: KeyID) -> Self {
         let mut r = Vec::with_capacity(8);